JP2004096847A - Rotor of alternator for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable rotor of an alternator for a vehicle by gathering a lead wire of a slip ring and a lead wire of a field coil to a single point, for easy and sure connection operation. <P>SOLUTION: By having a lead wire holder of insulator provided with a terminal which gathers and a field coil lead wire and a slip ring lead wire jointed, which is press-fitted and secured in a rotor shaft, two connection operations of lead wires which were separately connected can be made at a single point, for easy and sure connection operation. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotor of an automotive alternator that is driven to rotate by an engine or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a rotor of a vehicle alternator has a lead in which ends of a slip ring lead wire and a coil lead wire are connected to the rotor, as described in [0019] of JP-A-7-213026. It is supported by a line holder. [0027] of the publication discloses that the end of the slip ring lead is connected to the end of the coil lead by, for example, soldering.
[0003]
FIGS. 4, 7, and 8 of JP-A-60-200745 and the embodiment thereof include a slip ring assembly (slip ring device) and a cover ring (slip ring lead wire holder). A ring lead wire (slip ring lead wire) is wired and integrally molded, a slip ring assembly (slip ring device) with a slip ring lead wire (slip ring lead wire) and a cover ring (slip ring lead wire holder). ) And a slip ring lead wire (slip ring lead wire) are electrically connected to a slip ring lead wire (slip ring lead wire). ) Is formed integrally and the covering (s Tsu purine Greed wire holder) range with the field winding and the slip ring leads (be connecting the slip ring leads) is disclosed.
[0004]
[Problems to be solved by the invention]
In the former known example, the lead wire of the slip ring and the lead wire of the field coil are held using a lead wire holder passed through a shaft, and the ends thereof are connected by soldering or the like. This is a guide for connecting two lead wires, and it is necessary to hold the connection portion in some way while connecting.
[0005]
Further, the latter known example has an effective configuration for the formability of the slip ring device and the dust prevention of the bearing. However, the connection between the lead wire of the slip ring and the lead wire of the field coil is the same as that of the former. Basically, they are connected to each other, and the same problem as the former occurs.
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotor for an AC generator for a vehicle, in which a lead wire of a slip ring and a lead wire of a field coil are gathered at one place to easily and reliably perform connection work and have high reliability. It is in.
[0007]
Another object of the present invention is to provide a rotor of an automotive alternator that can securely fix a lead wire holder for holding a lead wire to a shaft with increased productivity.
[0008]
[Means for Solving the Problems]
The present invention holds a pair of slip rings for supplying current to a field winding, a slip ring lead wire connected to each of the slip rings, and the other end of the slip ring lead wire, What is claimed is: 1. A rotor for an automotive alternator, comprising: a lead wire holder for connecting a magnetic winding lead wire and a slip ring lead wire, wherein the lead wire holder comprises a terminal for joining the two lead wires. This is achieved by a rotor of an automotive alternator, which is formed of a ring-shaped insulator and is press-fitted and fixed to a rotor shaft.
[0009]
Preferably, the present invention is achieved by molding the terminal into an insulator and projecting to an outer diameter.
[0010]
Preferably, the present invention is achieved in that the insulator is press-fitted and fixed to the inner peripheral surface thereof through a plurality of projections extending in the axial direction.
[0011]
Preferably, the present invention is achieved by the insulator having a shaft introduction portion on the inner peripheral surface thereof and being press-fitted and fixed through a plurality of axially extending projections behind the introduction portion. .
[0012]
According to a preferred embodiment of the present invention, the insulator is provided with a tongue that engages with the slip ring lead wire groove on the inner peripheral surface thereof.
[0013]
Others of the present invention, a pair of slip rings for supplying current to the field winding, a slip ring lead connected to each of the slip rings, and holding the other end of the slip ring lead, A rotor for an automotive alternator comprising a field wire lead wire and a lead wire holder connecting a slip ring lead wire, wherein the lead wire holder is made of a ring-shaped insulator. Achieved by a rotor of an automotive alternator characterized by being provided with a shaft introduction portion on a peripheral surface and a plurality of axially extending projections behind the introduction portion and being press-fitted and fixed to a rotor shaft. Is done.
[0014]
Preferably, the present invention is attained by arranging the projections at equal pitches at axially symmetric positions on the inner peripheral surface of the lead wire holder.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a rotor of an automotive alternator according to an embodiment of the present invention will be described with reference to examples shown in the drawings.
[0016]
FIG. 1 shows a rotor 1 of a so-called Rundel type vehicle alternator, in which a shaft 2 is rotatably supported by a pair of left and right bearings 3A, 3B. On the shaft 2 located between the bearings, a pair of claw-shaped magnetic poles 12A and 12B which are arranged in an axially opposed manner and enclose a cylindrical field winding 11 using a knurl and plastic coupling method. Mechanically fixed.
[0017]
The slip ring device 4 includes a slip ring base 41 made of a molding material as shown in FIG. 2 and a slip ring 43A, which is held on the outer periphery of the slip ring base 41 with slip ring lead wires 42A and 42B interposed therebetween. 43B.
[0018]
The lead wire holder 5 mounted on the bearing support portion 21 of the shaft 2 is made of a thermosetting resin such as phenol as an annular insulator as shown in FIGS. In the figure, a sliding surface 51 having a diameter at least larger than the diameter of the bearing support portion 21 is integrally formed with a plurality of projections 52 extending in the axial direction at the rear thereof. It is arranged in a shape. A plurality of the projections 52 are provided at substantially the same width at the axially symmetric positions, and a tongue piece 53 is further integrally formed at a part between the projections, and is engaged with one of the wiring grooves 21A and 21B of the bearing support portion 21. ing.
[0019]
Reference numerals 6A and 6B denote a pair of conductive terminals provided at axially symmetrical positions of the lead wire holder 5, and hooks for integrally molding the lead wire holder 5 and guiding the lead wires 11A and 11B of the field winding. It is adjacent to 54A, 54B in the rotation direction. On the other hand, on the side of the slip ring 4 of the lead wire holder 5, wiring grooves 55A and 55B having one ends opened are formed and communicate with the wiring grooves 21A and 21B. Here, the slip rings 43A and 43B have an outer diameter smaller than the inner diameter of the bearing 3B in consideration of installation in the axial direction.
[0020]
In assembling the rotor, the pair of claw-type magnetic poles 12A and 12B are mechanically fixed to the shaft 2 with the field winding 11 therebetween, and then the lead wire holder 5 is mounted on the bearing support 21 of the shaft 2. . First, the sliding surface 51 of the lead wire holder 5 is inserted into the bearing support by being guided by the bearing support 21. At this time, the tongue piece 53 is located at the same position as one of the wiring grooves 21A and 21B provided at the axially symmetrical position, and as the insertion of the lead wire holder 5 proceeds, the interference in the rotation direction acts to restrict the movement in the rotation direction. Insertion is continued in the state where it was done.
[0021]
As the insertion proceeds further, the tips of the plurality of projections 52 located behind the sliding surface are compressed, and the bearing support 21 is elastically deformed until the tip of the lead wire holder 5 contacts the side surface of the claw-type magnetic pole 12B. Going firmly fixed.
[0022]
Next, a slip ring device 4 including a slip ring base 41 made of a molding material, slip ring lead wires 42A and 42B, and slip rings 43A and 43B is press-fitted and fixed to a small diameter portion of the shaft via a detent such as a knurl. In this state, the outer diameter of the slip rings 43A, 43B is at least smaller than the outer diameter of the bearing support 21. Thereafter, the slip ring lead wires 42A, 42B, each of which is covered with an insulating tube in advance, is wired to each of the wiring grooves 21A, 21B formed in the bearing support 21, and the leading end is electrically connected through the wiring grooves 55A, 55B of the lead wire holder 5. To the sex terminals 6A and 6B.
[0023]
On the other hand, the lead wires 11A and 11B of the field winding are guided and held by the hooks 54A and 54B of the lead wire holder 5 through the side surface of the claw-shaped magnetic pole 12B, and the conductive terminals 6A as in the slip ring lead wires 42A and 42B. , 6B.
[0024]
The two lead wires 11A, 11B, 42A, 42B assembled in this way are surrounded and crimped by the respective terminals 6A, 6B, and then joined by soldering or welding. Thereafter, the bearings 3A and 3B are mounted on the shaft, and the rotor 1 is completed.
[0025]
The rotor configured in this manner is provided with a terminal for collecting and joining the field winding lead wire and the slip ring lead wire to a lead wire holder made of an insulator, and press-fitting and fixing the terminal to the rotor shaft. As a result, the two lead wires that have been connected in a dispersed manner can be joined at one place, and the connection work is easily and reliably performed.
[0026]
By protruding the terminal to the outside diameter from the mold insulator, the lead wires can be extremely easily integrated, and when automation is considered, the jig for the welding device is easily arranged, and the workability is further improved.
[0027]
The insulator is press-fitted and fixed through a plurality of protrusions extending in the axial direction on its inner peripheral surface. In comparison with the case where the entire inner peripheral surface of the ring lead wire is fixed with a margin, the stress in the circumferential direction generated in the slip ring lead wire holder by the fixing can be suppressed to be low.
[0028]
Since the insulator has a shaft introduction portion on its inner peripheral surface and is fixed by press-fitting through a plurality of axially extending projections behind the introduction portion, the slip ring lead wire holder is put on the shaft. Smooth insertion and connection are assured simply by inserting.
[0029]
The insulator has a tongue on its inner peripheral surface that engages with the slip ring lead wire wiring groove, so that the slip ring lead wire holder can be reliably positioned in the rotation direction when the holder is inserted, and no error occurs in the terminal position. The productivity becomes good.
[0030]
The lead wire holder is made of an annular insulator, and is provided with a shaft introduction portion on its inner peripheral surface and a plurality of projections extending in the axial direction behind the introduction portion and being press-fitted and fixed to the rotor shaft. In addition, the circumferential stress generated in the slip ring lead wire holder can be kept low, and the workability of assembling to the shaft is improved.
[0031]
In the other embodiment, a plurality of protrusions are formed on the inner peripheral surface of the slip ring lead wire holder 5 on the side of the slip ring device. However, the protrusions may be circular, square, or rhombic. Their tips may be pointed. If necessary, the entire inner peripheral surface or a part of the inner peripheral surface may be used. It is good if the range is substantially 1/3 or more of the axial length.
[0032]
In addition, the tongue piece 53 provided on the lead wire holder is not always necessary, and can be omitted as long as the holder can be arranged at a specified position using a jig or the like.
[0033]
【The invention's effect】
The present invention includes a terminal that collectively joins a field winding lead and a slip ring lead to a lead wire holder made of an insulator and joins the terminals by press-fitting and fixing the same to a rotor shaft. The connection of the two lead wires can be made at one place, and the connection work is easily and reliably performed.
[0034]
According to the present invention, the lead wire holder is formed of an annular insulator, and a shaft introduction portion is provided on an inner peripheral surface thereof, and a plurality of protrusions extending in the axial direction behind the introduction portion are provided and fixed to the rotor shaft by press-fitting. As a result, the circumferential stress generated in the slip ring lead wire holder can be kept low, and the workability of assembling to the shaft is improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a rotor of a vehicle alternator.
FIG. 2 is a cross-sectional view of a slip ring side end of a rotor of the vehicle alternator.
FIG. 3 is a detailed perspective view of a rotor of the vehicle alternator.
FIG. 4 is a front view of a slip ring lead wire holder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotor of AC generator for vehicles, 2 ... Shaft, 4 ... Slip ring device, 5 ... Lead wire holder, 6A ... Terminal, 11 ... Field winding, 11A, 11B ... Lead wire of field winding, 21A, 21B: wiring groove, 42A, 42B: slip ring lead wire, 52: strip projection, 53: tongue piece, 54A, 54B: hook, 63: inner peripheral surface of slip ring lead wire.

Claims (7)

A pair of slip rings for supplying a current to the field winding, a slip ring lead connected to each of the slip rings, and the other end of the slip ring lead; A rotor for a vehicle alternator having a lead wire connecting a wire and a slip ring lead wire, wherein the lead wire holder has an annular shape provided with a terminal for joining the two lead wires. A rotor for an automotive alternator, comprising an insulator and being press-fitted and fixed to a rotor shaft. The rotor of an alternator for a vehicle according to claim 1, wherein the terminal is molded on an insulator and projects to an outer diameter. 3. The rotor of an automotive alternator according to claim 1, wherein the insulator is press-fitted and fixed to an inner peripheral surface of the insulator through a plurality of axially extending protrusions. The insulator according to claim 1 or 2, wherein the insulator has a shaft introduction portion on an inner peripheral surface thereof, and is fixed by press-fitting through a plurality of axially extending projections behind the introduction portion. Rotor of a vehicle alternator. 5. A rotor for an automotive alternator according to claim 1, wherein the insulator has a tongue on an inner peripheral surface thereof for engaging with a slip ring lead wire wiring groove. A pair of slip rings for supplying a current to the field winding, a slip ring lead connected to each of the slip rings, and the other end of the slip ring lead; A rotor for an automotive alternator comprising a lead wire connecting a wire and a slip ring lead wire, wherein the lead wire holder is made of an annular insulator, and a shaft introduction portion is provided on an inner peripheral surface thereof. And a plurality of projections extending in the axial direction at the rear of the introduction portion and being press-fitted and fixed to the rotor shaft. 7. The rotor of an automotive alternator according to claim 6, wherein the protrusions are arranged at equal pitches at axially symmetric positions on the inner peripheral surface of the lead wire holder.

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